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General opinion seems to be that the rods are the weak point. When comparing STi vs WRX blocks, it's the rods that stayed the same, the pistons were different. So another way of thinking about it is, do you want those old WRX rods in there after you've spent all that time trying to build a good bottom end?
If your Budget is tight and cannot afford to fit Forged rods(would recommend it though) get some STi Version 9 rods and some ARP rod bolts to suit the rods.